Dont forget to also flush your hot water system.
The important thing is not to mix different antifreeze types, so if you are fully flushing first, you will be fine.
I am planning to do the same on my D2 55 next time I remove the heat exhanger for a proper clean and O-ring replacement.
I would prefer to carry on board an antifreeze concentrate, rather than the expensive, ready mixed Volvo brew.
The membership association for owners of Dufour Yachts